• Proceedings of the KSME Conference
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• 2007.05b
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• pp.3168-3172
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• 2007

As the minimum feature size decreases, control of contamination by nanoparticles is getting more attention in semiconductor process. Cleaning technology which removes nanoparticles is essential to increase yield. A reference wafer on which particles with known size and number are deposited is needed to evaluate the cleaning process. We simulated particle trajectories in the chamber by using FLUENT and designed a particle deposition system which consists of scanning mobility particle sizer (SMPS) and deposition chamber. Charged monodisperse particles are generated using SMPS and deposited on the wafer by electrostatic force. The experimental results agreed with the simulation results well in terms of particle number and deposition area according to particle size, flow rate and deposition voltage.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.24 no.5
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• pp.417-424
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• 2006

Despite of many researches related to create 3D digital maps, it is still time-consuming and costly because a large part of 3D digital mapping is conducted manually. To circumvent this limitation, we proposed methodologies to create 3D digital maps with 3D symbols automatically. For this purpose, firstly, the 3D symbol library to represent 3D objects as 3D symbols was constructed. In this library, we stored the attribute and geometry information of 3D objects which define types and shapes of symbols respectively. These information were used to match 3D objects with 3D symbols and extracted from 2D digital maps and LiDAR(Light Detection and Ranging) data. Then, to locate 3D symbols into a base map automatically, we used predefined parameters such as the size, the height, the rotation angle and the center of gravity of 3D objects which are extracted from LiDAR data. Finally, the 3D digital map in urban area was constructed and the results were tested. Through this research, we can identify that the developed algorithms can be used as effective techniques for 3D digital mapping.

• 정보화사회
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• s.177
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• pp.12-13
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• 2005

지난 1월 세계 최초로 휴대폰을 이용한 위성DMB 시범서비스가 개시된 이후, 전세계적으로 주목을 받았던 국내 위성DMB서비스. 그러나 지난 5월 본격적인 상용서비스가 개시된 이후 10월말 기준 가입자 25만명에 그치고 있다. 이는 당초 올해 목표치였던 60만명에 한참 못미치는 수치. 업계에서는 "이 정도면 안착" 과 "전망 불투명"이라는 평가가 반반이다.

• 주택과사람들
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• s.210
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• pp.14-17
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• 2007

작금의 주택 시장 침제는 위기 상황에 빠져 있으며, 주택 산업이 연관 산업에 미치는 영향이 다른 산업보다 훨씬 크다는 것은 누구나 알고 있는 바, 주택 시장을 이대로 방치해 주택 업체들의 부도 도미노 현상이 현실화된다면 국민의 주거 불안은 물론 국가 경제에 막대한 악영향을 미칠 수 있다. 주택 시장의 당면 과제와 정상적인 궤도에 안착시킬 수 있는 방안에 대해 살펴본다.

• Bulletin of Korea Environmental Preservation Association
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• s.419
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• pp.5-8
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• 2015

화관법의 전면 개정으로 화학사고 예방 대비 대응을 위한 제도적 정비는 일단락되었으나 제도의 집행과 실천이 중요하다. 이에 정부는 제도의 집행역량을 강화하기 위해 전문성을 확보하고 현장적용성을 꼼꼼하게 검토할 것이며, 중소기업에 대한 안전진단 컨설팅 등 정부가 할 수 있는 지원을 지속할 것이며, 현장의 애로사항도 계속 발굴하여 제도가 안착될 수 있도록 노력할 것이다. 사업장도 스스로 안전관리를 강화하고 안전의식을 높이기 위해 노력해주기를 바란다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.10a
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• pp.301-305
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• 2013

북한은 김정은 체제의 조기 안착과 장기적 안정성 확보를 위해 경제난을 해결하고자 개혁 개방정책으로 변화 시도가 기대됨에 따라 북한이 개혁 개방정책을 시도할 경우 해운항만의 개방에 맞춰 북한의 해상 교역에 필요한 항행 안전시설에 대한 현황과 문제점을 짚어보고 우리나라의 역할과 지원방안에 대한 검토.

• Venture DIGEST
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• s.55
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• pp.9-9
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• 2004

올해 메가픽셀급 카메라폰의 본격 등장으로 카메라폰 시장에 또한번 휴대폰 부품업계들의 뜨거운 경쟁이 벌어지고 있다. 휴대폰용 부품업체 입장에서 보면 메가픽셀급 제품시장 안착은 곧바로 매출의 수직 상승과 수익구조 개선으로 직결되는‘황금알을 낳는 거위’를 확보하는 셈. 카메라폰 콘트롤러 기능과 MPEG4 등 멀티미디어 기능을 탑재한 칩들이 속속 발표되면서 시장 팽창이 가속되고 있다.

• Journal of the Korean Society for Marine Environment & Energy
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• v.15 no.1
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• pp.1-8
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• 2012

To arrange effectively artificial reefs for marine afforestation, tidal currents were analyzed by numerical experiments, and particle tracking based upon tidal currents were carried out to clarify the path of algae spore. The experiments were carried out by EFDC (Environmental Fluid Dynamics Code), and water column was vertically divided 10 layers. Tidal current patterns showed to be affected by main current at outside of study area, and circle currents of two were observed from analysis of residual currents. Particle tracking were experimented for 15 days at 2 installation places in which artificial reefs for marine afforestation would be deployed. According to the results of particle tracking experiment, particle movement at St.1 showed belt type along coastal line, and St.2 showed ellipse type at 300~500 m distant from coastal line. It suggest that artificial reefs for marine afforestation should be installed belt zone at station of St.1 and ellipse zone at St.2. Modelling algae transport was also tested to account for local dispersion of algae spore due to the suspended materials.

• Journal of The Korean Association For Science Education
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• v.39 no.2
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• pp.197-205
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• 2019

The purpose of this study is to derive ways to support Integrated Science curriculum implementation by evaluating the results of Integrated Science teacher training programs conducted by the Ministry of Education to support the settlement of 2015 revised Integrated Science curriculum. Teachers' output from the teacher training programs and interviews with training instructors in the 2017 Integrated Science Leading Teacher Training program were analyzed to derive the features of the Integrated Science curriculum and support plans for the implementation of Integrated Science in schools. Teachers who participated in the 2017 Integrated Science Leading Teacher Training program developed teaching, & learning and evaluation plans through participatory training sessions, where the achievement standards most selected by teachers were [10IS08-03] and [10IS09-04]. Through the text mining analysis of these achievement standards, we explored the implementation realities such as reconstruction of achievement standards, teaching and learning methods, learning materials, evaluation methods, and subject competencies. In addition, we analyzed exemplary reconstruction models of achievement standards in light of best integrated instruction, student-participatory instruction, and developing science competencies. Based on the results, we propose teacher training support plans and further studies for the implementation and settlement of the Integrated Science curriculum.

• Journal of Dental Rehabilitation and Applied Science
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• v.36 no.4
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• pp.222-231
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• 2020

To use the external connection implant (EXT) appropriately, the inter-implant distance should be carefully considered during placement, and the bones raised above the implants should be trimmed during the second surgery. The hex abutment is more useful than the non-hex abutment. EXT is particularly useful when the inter-arch space is limited. The tissue level (TL, internal butt connection) implant has a biomechanical advantage of coronal wall thickness and a biological advantage of an inherent transmucosal smooth surface. During TL implant restoration, an abutment can be selected using the abutment and fixture margins with considerations for the inter-arch space. Since no single type of implant can satisfy all the cases, it is necessary to select the appropriate type, considering the occlusal force and the bone condition.